2018/6/5 17:32:45
Vacuum generator performance
Vacuum generator performance is related to many factors such as the zui small diameter of the nozzle, the shape of the contraction and diffusion tubes, the diameter of the flux and its corresponding position, and the magnitude of the gas source pressure. Vacuum generator pressure at the suction inlet, suction flow, air consumption and supply pressure of the relationship between the curve. When the supply pressure reaches a certain value, the pressure at the suction inlet is low, and then the suction flow rate reaches zui big, when the supply pressure continues to increase, the pressure at the suction inlet increases, and then the suction flow rate decreases.
Vacuum generator performance
Specifically as follows: 1. Vacuum generator in the premise of meeting the requirements of the use of its air consumption should be reduced, air consumption and compressed air supply pressure is related to the pressure, the greater the pressure, the greater the vacuum generator's air consumption. Therefore, in determining the size of the suction inlet pressure duty to pay attention to the supply pressure of the system and the relationship between the amount of gas consumption, the general vacuum generator produced by the suction inlet pressure in the 20kPa to 10kPa between. At this time, the pressure of the supply table increases again, the pressure at the suction inlet will not be lowered again, while the gas consumption increases. Therefore, to reduce the pressure at the suction inlet should be considered from the control of flow rate.
2. Adsorption response time is related to the volume of the adsorption chamber, the leakage of the adsorption surface and the size of the required suction inlet pressure. For a certain suction inlet pressure requirements, if the volume of the adsorption chamber is smaller, the shorter the response time; if the suction inlet pressure is higher, the smaller the adsorption volume, the smaller the surface leakage, the shorter the response time of the adsorption; if the adsorption volume is large, and the adsorption speed to be fast, the nozzle diameter of the vacuum generator should be larger.
3. The length of the diffusion pipe should ensure that a variety of wave systems at the exit of the nozzle is fully developed, so that the diffusion pipeline exit cross-section to obtain an approximate uniform flow. But the pipe is too long, the pipe wall friction loss increases. General pipe work for the pipe diameter of 6 - 10 times more reasonable. In order to reduce the energy loss, can be in the diffusion pipe straight pipe outlet plus an expansion angle of 6 ° - - 8 ° expansion section.
4. In the inhalation of noisy * closed conditions, the relationship between the suction inlet pressure Pv and suction flow under specific conditions. In order to obtain a more ideal suction inlet pressure service and suction flow rate matching relationship, can be designed as a multi-stage vacuum generator combined in series.
5. Sometimes due to the shape of the workpiece or material, it is difficult to obtain a low suction inlet pressure, due to the suction inlet pressure rise from the edge of the suction cup or through the workpiece inhalation of air. In this case, it is necessary to correctly size the vacuum generator so that it can compensate for the pressure rise at the suction inlet caused by leakage. Since it is difficult to know the effective cross-sectional area at the time of leakage, the pressure rise at the suction inlet due to leakage can be determined by a simple test. Since it is difficult to know the effective cross-sectional area at the time of leakage, a simple test can be performed to determine the amount of leakage. The test circuit consists of a workpiece, a vacuum generator,